BTW, I just realized function attributes for xsave and avx512 don't work on
MSVC (see
https://developercommunity.visualstudio.com/t/support-function-target-attribute-and-mutiversioning/10130630).
Not sure if you care about it. Its an easy fix (see
https://gcc.godbolt.org/z/Pebdj3vMx).
The following review has been posted through the commitfest application:
make installcheck-world: tested, failed
Implements feature: tested, failed
Spec compliant: tested, failed
Documentation:tested, failed
Changes LGTM. Makes the Makefile look clean. Built and ran te
